Dar Bantlı Konuşma İzgel Zarfının Sinir Ağları Kullanılarak Genişletilmesi ve Kalitesinin Artırılması

Year 2020, Volume: 22 Issue: 64, 47 - 58, 24.01.2020

Gürhan Bulu , Ahmet Semih Bingöl

https://doi.org/10.21205/deufmd.2020226406

Abstract

Geleneksel telefon sistemlerinde,
7−8 kHz’e kadar bileşenleri olan insan sesi 3.4 kHz bant genişliğine sahip bir
alçak geçirgen süzgeçten geçirilip 8 kHz’te örneklenerek gönderilir. Kodlama ve
benzeri işlemlerden kaynaklanan hiçbir kayıp olmasa bile, yüksek frekans
bölgesinin süzülerek kaybolmasından kaynaklanan bir kalite kaybı söz konusudur.
Bu kayıp, anlaşılabilirliği pek etkilememekle beraber konuşma kalitesinde
hissedilir bir bozulmaya yol açmaktadır. Bu çalışmada, izgel zarfın düşük
frekanslı bölgelerinden faydalanılarak; süzülen yüksek frekanslı bölgelerin
izgel zarfı elde edilmeye çalışılmış ve izgel zarfın genişletilmesi olarak da
nitelenebilecek bu işlem için yapay sinir ağları yöntemi kullanılmıştır. Daha
sonra genişletilen bu izgel zarf kullanılarak kaybolan yüksek frekanslı
bölgeler kaynak-süzgeç modeliyle yeniden oluşturulmuş ve böylece konuşma kalitesini
artırılması hedeflenmiştir. Geliştirilen bu yöntem telefon kalitesindeki
konuşmalar için kullanılmakla birlikte, daha düşük bant genişliğine sahip
konuşmalar (1.8 kHz) için de kullanılabilir.

Keywords

İzgel zarf genişletme, İzgel zarf dışdeğerleme, konuşma kalitesi iyileştirme, sinir ağları

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